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A shooting near the Eisenhower Expressway Saturday night led to massive traffic backups. (Published Sunday, July 27, 2014)

Editor's Note: NBC Chicago includes shootings that took place between 6 p.m. Friday and 12 a.m. Monday in the weekend violence report.

Shootings Saturday and Sunday increased the total number of people shot in Chicago over the weekend to 23.

Casualties over the weekend include a 13-year-old boy who was shot and killed at about 6 p.m. Friday in the 700 block of South California Avenue. Six others were also wounded in a shooting that witnesses say was a drive-by.

"As a result again of guns being introduced into what otherwise would have been a fist fight, we have seven kids shot ... and one of theme dead," Chicago Police superintendent Garry McCarthy said Sunday.

"At the end of the day if we stem the flow of guns coming in and we put people in jail for possession of firearms, we'll see the murder rate and violent in this city plummet."

A 3-year-old was also critically wounded Friday night when he was shot at about 10:15 p.m. in the 4400 block of South Sacramento Avenue. The bullet struck the young boy in his abdomen and exited through his hip, officials said. Police say the child's mother's boyfriend was the intended target.

Alger Sanchez, 19, and Anton Aseves, 22, were charged Sunday night with aggravated battery-discharge of a firearm and two felony counts of attempted murder in the first degree.

A 32-year-old man was grazed in the neck by a bullet 8 a.m. Sunday on the 2900 block of North Milwaukee Avenue. The victim told police that he was shot by an unknown person in a grey vehicle. He took himself to an area hospital where he was listed in good condition. Police say the victim has documented gang ties. No one is in custody.

At about 3:50 a.m. Sunday, a man was shot while sitting in the back of a car outside a party at 58th and Wolcott. Police say two people began arguing outside of the car, and one of them fired a gun, striking the individual inside the car. The victim was taken to a local hospital where he was listed in critical condition.

Police say a woman and her boyfriend were walking out of a nightclub in the 100 block of West Huron when they became involved in an altercation with another man. The boyfriend produced a gun, which he dropped during the struggle, according to police. The woman picked up the gun and place it in her purse, but was shot in the leg when her boyfriend reached for it. She's listed in stable condition at a local hospital.

At about 4:40 a.m., police say a man walked into Christ Hospital with a bullet wound to his right ankle. The victim says he was walking down the street in the 5600 block of South Emerald Street when he was approached by two males who asked if he was from the neighborhood. He said he kept walking, heard shots, and felt the pain in his ankle. Nobody is in custody for the shooting.

A 27-year-old man walking in the 2600 block of West Augusta at about 11:15 p.m. Saturday says he suddenly felt pain and discovered he was shot in the hip. He took himself to a local hospital where he was listed in stable condition. Police say he is a documented gang member. Nobody is in custody for the shooting.

A 15-year-old boy was shot in the 133rd block of South Eberhart at about 10 p.m. The victim says he was walking down the street, heard shots and felt pain in his neck. He was listed in stable condition.

A 36-year-old man is listed in stable condition after he was shot near the Eisenhower Expressway at about 8:45 p.m. Saturday. The victim was talking to a woman at a gas station in the 600 block of South Independence when he says an individual approached the pair with a gun and announced a robbery. The man says he tried to knock the gun away but it discharged, striking him in the stomach. The man drove to the highway ramp where the was met by EMS. Nobody is in custody for the shooting and attempted robbery.

A 24-year-old man is listed in stable condition after he was shot in the calf at about 1:30 p.m. in the 1700 block of West Farwell Avenue. Police say the victim is a documented gang member with a felony conviction. Nobody is in custody for the shooting.

Police say the victim of a shooting at about 12:45 p.m. Saturday is not cooperating with investigators. The 26-year-old man was sitting the driver's seat of a car at 52nd and Hoyne when he was shot. He's listed in serious condition with a wound to the chest after a friend drove him to a local hospital.